Broadband nonlinear optical microresonator array for topological second harmonic generation
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866915361123729408 |
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| author | Wang, Ruoyu Pan, Yiming Shen, Xiaoqin |
| author_facet | Wang, Ruoyu Pan, Yiming Shen, Xiaoqin |
| contents | Topological photonics enables robust light manipulation with third-order optical nonlinearity, yet integrating second-order optical nonlinearity into a topological system faces fundamental challenges: frequency-dependent topological bandgaps impede simultaneous edge states for pump and second harmonic photons at an octave. Here we present a broadband topological nonlinear photonic system via dual frequency topological bandgap engineering in a 2D nonlinear microresonator array. By designing a square lattice with synthetic magnetic fluxes, we achieve topological phase matching preserving unidirectional edge states for both frequencies while enabling efficient second-harmonic generation. The system exhibits flux-programmable SH chirality, where SH photons reverse propagation direction via Chern number transitions (e.g. C = -1 to +1) without sacrificing robustness. Moreover, we show that the design theoretically yields over 100 times higher SHG efficiency than single resonators at high powers via topology-enhanced coherent buildup. Our topological SHG works in a parameter regime that can be readily accessed by using existing low-loss integrated photon platforms like thin film lithium niobite. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_21388 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Broadband nonlinear optical microresonator array for topological second harmonic generation Wang, Ruoyu Pan, Yiming Shen, Xiaoqin Optics Topological photonics enables robust light manipulation with third-order optical nonlinearity, yet integrating second-order optical nonlinearity into a topological system faces fundamental challenges: frequency-dependent topological bandgaps impede simultaneous edge states for pump and second harmonic photons at an octave. Here we present a broadband topological nonlinear photonic system via dual frequency topological bandgap engineering in a 2D nonlinear microresonator array. By designing a square lattice with synthetic magnetic fluxes, we achieve topological phase matching preserving unidirectional edge states for both frequencies while enabling efficient second-harmonic generation. The system exhibits flux-programmable SH chirality, where SH photons reverse propagation direction via Chern number transitions (e.g. C = -1 to +1) without sacrificing robustness. Moreover, we show that the design theoretically yields over 100 times higher SHG efficiency than single resonators at high powers via topology-enhanced coherent buildup. Our topological SHG works in a parameter regime that can be readily accessed by using existing low-loss integrated photon platforms like thin film lithium niobite. |
| title | Broadband nonlinear optical microresonator array for topological second harmonic generation |
| topic | Optics |
| url | https://arxiv.org/abs/2506.21388 |